DISTRIBUTION COEFFICIENTS OF PLATINUM-GROUP METALS BETWEEN SOIL SOLIDAND LIQUID-PHASES

Distribution coefficients (K(d)s) of platinum group metals (Rh, Ir,and Pt) were measured by a batch technique for agricultural soils collect ed in Japan using a multitracer solution containing their radioisotope s (Rh-101, Ir-189, and Pt-191). The radioisotopes were produced by irr adiating a gold foil with a N-24 beam accelerated to 135 MeV/nucleon i n the RIKEN Ring Cyclotron. The probability distributions of these nuc lide K(d)s were not normal type distributions but log-normal ones. The K(d)s of Pt were larger than those of Rh and Ir and the K(d)s of Rh h ad larger variability compared to that of Ir. The K(d)s of Rh and Ir h ad adequate correlations with selected soil properties relating to day minerals such as activated aluminum content. For the platinum K(d)s, no good correlation was found with any soil properties examined.